This was reported on Twitter by the local police.
“Preliminary investigation showed that a 16-year-old student accidentally detonated a home-made explosive device that he brought to school.
The device exploded in the classroom, injuring the 16-year-old himself and four other classmates, ”the report said.
The school was evacuated due to an emergency.
Earlier it was reported that a teenager was killed in a shooting at a school in the US state of Arkansas.